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7 psi is what its set up for now. If you notice on the AA page they say it goes up to stage 11 at 500hp so it will have high boost levels in order to reach that mark and I am sure a head gasket will be in there somewhere

What they are saying is that it is the same blower as in their e46 m3 kit which is capable of 500hp.

Why do we dyno our cars in 4th?
5th is 1:1
{^^ legitimate question, not being smartass}

Why does 1:1 matter? The wheel speed is still reduced by the differential ratio, which is different on many models.

Basically as long as the car doesn't peel out on the dyno drum it doesn't matter what gear the car is in. There is a pulse sensor attached to the engine which tells the dyno what the engine rpm. Dyno will calculate the proper tq reading regardless of gearing or tire circumference.

__________________"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. It’s habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, I’m Nelson, and I’m a drivaholic."